The husky is called Leia and was bought in 2009 when she was eight years old.
The two male and female border collies are Loki and Storm respectively.
"We gave up hope on Leia after a few months. Storm was just miserable and I needed a running buddy so we thought we'd get another one and we bought Loki from Waiuku," Mr Soper said.
Life carried on reasonably well until Wednesday evening when his brother called to say a friend had seen the video of a dog on the social media website Northland Grapevine that looked like Leia.
His reaction: "Yeah it's been a year, no way it's gonna be her."
It wasn't until they viewed the video with a dog loitering around a swamp in Kawakawa that all began "bawling their eyes out".
Mrs Soper recognised a name in the video and contacted a woman in Kawakawa who set off to look for Leia.
That spurred the police officer into action. "I had my jeans, hoodie, gumboots and torch and set off ... I was pretty much set for the night."
Leia was found walking around the Kawakawa Police Station before Mr Soper arrived.
She recognised him straight away. His next challenge is to trim her weight down from 26.5kg to 19kg, her weight a year ago.